Enhance encoding guessing rate and decoding email body parts

[pi-infected]

Hi,

I am processing huge quantity error and I've noticed that sometimes there is a problem with encoding detector & decoding email body parts.

I've enhanced this part by monkey patching flanker, and I have decreased the encoding problem rate.

I guess you will be interested by updating this part with my code 👍

# Monkey patching
import charset_normalizer
from flanker.mime.message import utils
from flanker.mime.message import errors

def _guess_and_convert_with(value, detector=charset_normalizer):
  """
  Try to guess the encoding of the passed value with the provided detector
  and decode it.

  The detector is charset_normalizer module.
  """
  result = detector.from_bytes(value).best()

  if not result:
    raise errors.DecodingError("Failed to guess encoding")

  try:
    value = str(result)
    return value

  except (UnicodeError, LookupError) as e:
    raise errors.DecodingError(str(e))

def _guess_and_convert(value):
  """
  Try to guess the encoding of the passed value and decode it.

  Uses charset_normalizer to guess the encoding.
  """
  return _guess_and_convert_with(value, detector=charset_normalizer)

utils._guess_and_convert_with = _guess_and_convert_with
utils._guess_and_convert      = _guess_and_convert